miles: my guide for this extraordinary tour was nuclear engineer lake barrett.campaign for the nuclear regulatory commission in the wake of the three mile island meltdown in 1979. he is now a paid consultant to the owner of fukushima, the tokyo electric power company, tepco. lake barrett: if it was fresh water, i would drink it and have my grandchildren drink it. ok. so it's not a risk that i believe -- and most people believe -- is one of concern. miles: but fisherman haruo ono is not convinced. homeport for him is 30 miles to the north of the plant in soma city. after the tsunami and subsequent triple meltdowns in 2011, he and the others here were put out of business, unable to sell seafood for fear of contamination. haruo ono: we couldn't sell fish in the beginning, but we tried hard and eventually resumed. but this time, we may not be able to sell fish because they will release the water forever. miles: forever, in this case, is about 35 years. that is how long tepco says it needs to safely drain these tanks into the pacific ocean. the company is anxious to

my guide for my seventh visit to fukushima is nuclear engineer lake barrett.eanup for the nuclear regulatory commission after the three mile island meltdown in pennsylvania in 1979. he is now a paid consultant to the tokyo electric power company , tepco, which owns fukushima and manages the decommissioning. >> so this is very similar, in my opinion, to sort of like putting a man on the moon. >> are there moonshot resources being applied to this? >> this is a multibillion dollar a year effort being spent at fukushima right now. it's going to take some time to complete this work. >> you're going to live to see it? >> probably not. >> we began our tour as close to the meltdowns as humans can dare. so the rusty steel frames of the structure -- >> that is the original structure where it was blown off by the hydrogen explosion. they have to build steel structure all the way around. there will be hundreds of tons of steel because it has to hold up 100 ton cranes to be able to dig down inside the building eventually. >> the ultimate goal is to develop robotic technolo